On the microscopic scale, internal energy is correctly defined as energy stored in the __________.

Question

bonds between atoms, but not in the motion of atoms

motion of objects visible to the eye

motion of atoms, and the bonds within atoms and molecules
motion of atoms, but not in the bonds between atoms
is it the last one?

Answer 1

Nope, not the last one. Consider ice.

Answer 2

the second one?

Answer 3

you are guessing, stop it. What changes in materials require energy?

Answer 4

third one?

Answer 5

of course, bonds and motion.